Z20 UPPER CRETACEOUS-LOWER TERTIARY FORAMINIFERA 



described by Said & Kerdany (1961) as G. triplex (Subbotina) is possibly G. loeblichi 

 sp. nov. ; Acarinina triplex is synonymous with both Globigerina velascoensis and 

 G. stonei, as mentioned above. Again, although the holotype of Acarinina 

 pseiidotopilensis Subbotina is a junior synonym of Globorotalia esnaensis (Le Roy), 

 the paratype figured by Subbotina (1953, pi. 22, figs. la-c) most probably belongs 

 to the present species. Hillebrandt (1962) described as Globorotalia (Truncorotalia) 

 aequa simulatilis (Sch wager) and Globorotalia {Acarinina) quetra Bolli, forms which 

 probably belong to G. loeblichi. 



Globorotalia loeblichi sp. nov. is believed to have evolved from G. aequa Cushman & 

 Renz by the development of a marginal keel, and by the reduction in the surface 

 rugosity and in the size of the umbilicus. On the other hand it is believed to have 

 evolved into G. quetra Bolli by the increase in the size of test ; by the development of 

 the slightly concave dorsal side, less tightly coiled test, distinctly spinose surface, 

 spinose keel, and by the reduction of the keel on the last one or two chambers. The 

 paratype figured by Bolli (1957&, pi. 19, figs. 4-6) is probably a transitional stage 

 between G. loeblichi and G. quetra, and forms mentioned by Bolli as G. cf. quetra may 

 belong to G. loeblichi. 



The present species is named after Dr. A. R. Loeblich, Jr. 



Holotype. P.45615. 



Paratypes. P.45669-70. 



Horizon and locality. Holo- and paratypes, from sample No. 68, Gebel 

 Owaina section. 



Stratigraphical range. Globorotalia loeblichi sp. nov. occurs in the uppermost 

 Paleocene G. aequa jG. esnaensis Subzone and in the Lower Eocene G. wilcosensis 

 Zone of the Esna-Idfu region. 



Globorotalia nicoli Martin 



1943 Globorotalia nicoli Martin : 27, pi. 7, figs. $a-c. 

 ? i960 Globorotalia convexa Subbotina ; Olsson : 45, pi. 9, figs. 13-15. 

 1962 Globorotalia nicoli Martin ; Gartner & Hay : 565, pi. n, figs. 3«-c. 



Remarks. This species is morphologically similar to both G. convexa Subbotina and 

 G. esnaensis (Le Roy). It differs from the former in its slightly larger size, flatter 

 dorsal side, fewer chambers per test and in the last whorl and in that its chambers are 

 more strongly elongated in the direction of coiling. It is distinguished from G. 

 esnaensis (Le Roy) by its smaller size, relatively compressed test, acute axial peri- 

 phery and less lobate equatorial one, more strongly elongated chambers in the 

 direction of coiling, slightly raised dorsal side and more tightly coiled test. 



The forms described by Mallory (1959, pi. 30, figs, ya-c) as G. nicoli Martin are 

 different from Martin's original description and figures, while those figured by him 

 (1959, pi. 42, figs. 4«-c) are possibly G. convexa Subbotina. Again, the forms 

 figured by Olsson (i960) as G. convexa Subbotina are most probably G. noicoli 

 Martin. Globorotalia nicoli is also morphologically similar to G. aequa Cushman & 

 Renz, from which it probably evolved. 



